Doubletree-clip



(No Model.) 1

. J. R. DAVIS..

DOUBLETREE CLIP. No. 365,735.

Patented June 28, 1887.

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N. PLIERS, Phmoumogmphnr, washington. D. C.

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A TTUR/VEY UNITED STATES PATENT FEICE. f

JOHN R. DAVIS, OF SUN PRAIRIE, VISCONSIN.

DOUBLETREE-CLIP.

SPECIFICATION forming part of Letters Patent No. 365,735, dated June 28,1887.

Application flcd Novcmberil, 1886. Serial 101.218,34.

To @ZZ whom it may concern,.-

Beitknownthat I, JOHN R. DAVS, a citizen of the United States, residingat Sun Prairie, in the county of Dane and State of Wisconsin, haveinvented certain new and useful Improvements in Doubletree-Clips; and Ido hereby declare the following to be a full, clear, and exactdescription ofthe invention, such as will enable others skilled in theart to which it pertains to make and use the same.

My invention relates to a doubletree-cli p in which the draft-link isadjustably pivoted to an oscillating clevis pivoted to the doubletreeand held in operative position by a coilspring,whereby said clevis anddraft-link, together with whiffletrec attached, are held rigid and firmfor all ordinary uses and purposes, but are also adapted to yield whenany unyielding obstruction is encountered, thereby saving from wear andbreakage the parts of the machine as well as the shoulders of thedraftanimals.

My device also performs the function of a draft equalizer, as will hemore fully described.

yFigure l is a top view of my device applied to the doubletree. Fig. 2is a perspective, in detail, of the oscillating clevis.

In the drawings, similar letters, where they occur, refer to like partsin both views.

D represents the doubletree; NV, one of the whifl'letrees; B, thedraft-link, to which the whifl'letree is hooked; and A the oscillatingclevis, to which is pivoted at its outer end the draft-link I3 by meansof the pivot-pin q. The

clevis A is preferably U-shaped, and is pro` vided with parallelpivot-arms extending from the sides of the clevis, the whole beingpivoted by means of the pin p to the doubletree D, and adapted tooscillate freely over the same. The draft-link B is also adapted toswing freely over the doubletree. The clevis is pivoted to thedoubletree, so that the open part of the U-shaped portion extendsontward. At the inner end of this clevis I secure a sliding rod, a, byhooking the bent end of said rod through a hole in the clevis, (see Fig.2;) butI do not wish to restrict myself to `this particular method ofattaching these parts, as it is obvious that other equivalent mechanicaldevices can be used to accomplish (No model.)

the same purpose-51s, for example, a plain bolthead or a uut and washer.

To the inner end of the slide-rod ,I secure a washer, b, provided with aslot to admit the free passage ofthe fixed rod a', hooked at itsouterand pivoted to the bolt c at its inner cnd.

Instead of the hook a washer may be secured to the outer end of thefixed rod o', being properly slotted to allow free play ofthe slid ing-rod a through the same, in a manner similar to that described for thewasher b. The coil-spring C is held in tension about the two rods a a',between the washer l) pt' the former and the hooked end of the latter.

A device similar in all respects to that described is also attachedtothe other end ofthe doubletree. (Not shown in the drawings.)

The operation is as follows: The tension of' the coil-spring C will besufficient to hold the clevis and the draft-link in their initial andnormal position, as shown by the full lines of the drawings, (see Fig.1,) except when some unyielding obstruction is suddenly met With. Thenthe strain on the whiffletree, being communicated through the draft-linkB, will act on the outer end ofthe clevis A to draw it forward andoutward into a position like that shown by the dotted lines, (see Fig.1,) at the same time compressing the coil-spring C. By this means thesudden shock is relieved, both as to the parts of the machine attachedto the doubletree and the shoulders of the draft-ani mals as well.Suppose in such a case that the doubletree is attached to a plow thepoint of which strikes against a stone or some other unyieldingobstruction. The plow-point will be saved from breaking and the strainwill be` taken up in compressing the coil-spring, as described. Themechanism is so adjusted, both as to the draftlink connection and thestiffness of the spring, that the clevis will not be drawn out to thelimit shown by the dotted lines unless the obstacle is absolutely undyielding, when the spring must be compressed to save the breakage oftheparts. Sudden and violent jerks, however, may be relieved by lessextensive oscillations of the clevis. Adj usting-holes q q'l areprovided in the outer end of the clevis A, whereby the draft-link B maybe adj ustabl y attached. This adjustment IOO may be necessary alike forboth ends of the doubletree when adjustment is made with refcrenee tothe nature of the work to be doneas for plowing; or it may be for thepurpose of equalizing the draft.

If it be desired' to have the spring respond less quickly, or if thestronger animal be attached to the whiffletree shown, then in eithercase the adjustment would consist in pivoting the draft-link at one ofthe inner holes, g q2.

I am aware of the Patent to Blackford, March l2, 1872, No. 124,537,draft-equalizer, and do not wish to be understood as' claiming anythingcovered by that patent.

Vhat I claim, and desire to secure by Letters Patent of the UnitedStates. is

l. In a doubletree-clip, an oscillating clevis pivoted to thedoubletree, as described, and provided with a series of adjusting-holesfor pivoting the draft-link, in combination with a draft-link, wherebythe latter may be adjustably attached to said clevis with reference tothe nature of the work to be done, so as vto relieve from the effects ofsudden strains the draftanimals, as well as the exposed parts of themachine to which the doubletree is attached, all as described, and forthe uses and purposes set forth.

2. In a doubletree-clip, in combination with au oscillating clevispivoted to the doubletree and provided with adjusting-holes and adraftlink adjustably pivoted thereto, a slide-rod secured at its outerend to said clevis and having at its inner end a washer slotted toallorir it to slide freely over a second parallel xed rod bolted at itsinner end to said doubletree, both of said rods being surrounded by acoilspring lheld in suitable compression between said washer on theinner end ofthe sliding rod and the hooked outer end of said parallelfixed rod, all as set forth.

3. In a doubletree-clip, in combination with an oscillating clevispivoted to the doubletree and a draft-link adjustably pivoted thereto, aslide-rod securedat its outerend to said clevis and provided at itsinner end With a washer slotted to allow it to slide freely over asecond parallel iixed rod bolted at its inner end to the doubletree,both of said rods being sur-v rounded by a coil-spring held in suitablecompression between said washer on the inner end of the sliding rod andthe hooked outer end of said fixed parallel rod, whereby thedraft-animals and the machine attached to the doubletree are protectedand relieved from sudden strains, substantial] y as described, and forthe uses andpurposes set forth.

4. In a doubletreeclip, in combination with an oscillating clevispivoted to the doubletree and provided with adjusting-holes and adraftlink adjustably pivoted thereto, aslide-rod secured at its outerend to said clevis and having at its inner end a washer slotted to allowvit to slide freely over a second parallel Xed rod bolted at its innerend to said doubletree, bothof said rods being surrounded by acoilspring held in suitable compression between said washer on the innerend of the sliding rod and the hooked outer end of said parallel fixedrod, whereby the draft-link may be so attached as' to equalize the workof the draft-animals, substantially as described, and for the uses and`purposes set forth.

5. In a doubletree-eli p, in combination witl the oscillating clevis A,'pivoted to the doubletree D by the pin p, and provided'with theadjusting-holes q q2, and the draft-link B, pivoted to said clevis bythe pivot-pin q, the slide-rod a, hooked to the clevis A, and having atits inner end the slotted washer b, the fixed rod a', passing throughsaid washer, being hooked at the-outer end and pivoted at the inner endto the bolt c, and the coil-spring C, held in compression between thewasher b and the hooked end of the fixed rod a, all as described, andfor the purposes set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribing-witnesses. f

JOHN R. DAVIS.

Vitnesses:

I. H. PERKINS, (3i-IAS. E. BUnLL.`

